<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>全屏菜单展开效果</title>
  <link rel="stylesheet" href="./css/L4.css">
</head>

<body>
  
  <div>
    页面主体内容。。。
  </div>

  <div class="mbox">
    <label for="menu">菜单</label>
  </div>

  <input type="checkbox" id="menu">
  <div class="cbox">
    菜单页面
  </div>


</body>

</html>